Re: /proc/cpuinfo shows only 2 processors on dual P4-Xeon system

[Andrew Theurer <habanero@us.ibm.com>]

Does your system BIOS have an option to enable/disable HT support?  If it 
does, make sure it is enabled.

I would have expected to see 4 ioapics, but hmm, I don't really know.

-Andrew Theurer

On Wednesday 26 February 2003 12:37, Andrew Walrond wrote:
> Grover, Andrew wrote:
> > Enable the ACPI "CPU enumeration only" option.
>
> Ok - just tried that, but I still see only two processors in cpuinfo
>
> Any ideas?
>
> Relevant part of dmesg:
>
> Using ACPI for processor (LAPIC) configuration information
> KERN_INFO Intel MultiProcessor Specification v1.4
>      Virtual Wire compatibility mode.
> OEM ID: ASUS     Product ID: PROD00000000 APIC at: 0xFEE00000
> I/O APIC #8 Version 17 at 0xFEC00000.
> I/O APIC #9 Version 17 at 0xFEC01000.
> I/O APIC #10 Version 17 at 0xFEC02000.
> Enabling APIC mode:  Flat.  Using 3 I/O APICs
> Processors: 4
> Building zonelist for node : 0
> Kernel command line: ro root=/dev/nfs ip=dhcp console=ttyS0,115200n8
> console=tty0 init=/boot/boot.sh
> Initializing CPU#0
> PID hash table entries: 4096 (order 12: 32768 bytes)
> Detected 2591.629 MHz processor.
> Calibrating delay loop... 5111.80 BogoMIPS
> Memory: 3100936k/4194304k available (1348k kernel code, 43644k reserved,
> 310k data, 304k init, 2228200k highmem)
> Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
> Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
> Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
> -> /dev
> -> /dev/console
> -> /root
> CPU: Trace cache: 12K uops, L1 D cache: 8K
> CPU: L2 cache: 512K
> CPU: Physical Processor ID: 0
> CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> CPU#0: Intel P4/Xeon Extended MCE MSRs (12) available
> CPU#0: Thermal monitoring enabled
> Machine check exception polling timer started.
> Enabling fast FPU save and restore... done.
> Enabling unmasked SIMD FPU exception support... done.
> Checking 'hlt' instruction... OK.
> POSIX conformance testing by UNIFIX
> CPU0: Intel(R) Xeon(TM) CPU 2.60GHz stepping 07
> per-CPU timeslice cutoff: 1462.69 usecs.
> task migration cache decay timeout: 2 msecs.
> enabled ExtINT on CPU#0
> ESR value before enabling vector: 00000000
> ESR value after enabling vector: 00000000
> Booting processor 1/1 eip 2000
> Initializing CPU#1
> masked ExtINT on CPU#1
> ESR value before enabling vector: 00000000
> ESR value after enabling vector: 00000000
> Calibrating delay loop... 5177.34 BogoMIPS
> CPU: Trace cache: 12K uops, L1 D cache: 8K
> CPU: L2 cache: 512K
> CPU: Physical Processor ID: 0
> CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#1.
> CPU#1: Intel P4/Xeon Extended MCE MSRs (12) available
> CPU#1: Thermal monitoring enabled
> CPU1: Intel(R) Xeon(TM) CPU 2.60GHz stepping 07
> Total of 2 processors activated (10289.15 BogoMIPS).
>
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